fummit 

A false summit a place, outcome, or experience which at the time felt like a final objective or longed-for goal, but which turns out to not to be, and makes you feel even worse as you realise how far away the real goal may be.

I used a different agent to make the polymer and immediately got a positive readout on the chromatograph, but my excitement was short-lived as I realised it was a fummit and the instrument was only picking up the reducing agent not the polymer.

fummit by Sharpeidic December 21, 2018

Chendo Fumpit 

When your honey gives you head, you pull out and spray your whelpin' yelp' juice in her nostrils and punch her in the forehead and slamp her across the mouth with your cock when she gives you the stinkface and yell "Fumpit!" as you run away laughing.

I got thrown out of my apartment because my landlord heard me pulling a chendo fumpit on the chick in 2B.

Chendo Fumpit by Kingnigger Slappings November 12, 2010